OFFSET
1,3
COMMENTS
Column 3 of A211963
EXAMPLE
Some solutions for n=4
..0........0........0........0........0........0........0........0
..1.2......0.1......1.2......1.2......1.2......1.2......1.2......1.2
..0.3.4....2.3.4....1.3.4....3.4.5....3.4.5....3.3.4....3.4.5....3.4.5
..5.6.7.6..0.5.6.0..5.2.5.6..0.6.6.0..5.6.0.4..5.6.6.1..5.2.1.6..5.0.5.6
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 26 2012
STATUS
approved